Boom arm



FIG. 1 is a front perspective view of the boom arm showing our new design, the microphone is drawn broken away to show indeterminate length;

FIG. 2 is a front elevation view of the boom arm as shown in FIG. 1;

FIG. 3 is a rear elevation view of the boom arm as shown in FIG. 1;

FIG. 4 is a top plan view of the boom arm as shown in FIG. 1;

FIG. 5 is a bottom plan view of the boom arm as shown in FIG. 1;

FIG. 6 is a left side elevation view of the boom arm as shown in FIG. 1; and,

FIG. 7 is a right side elevation view of the boom arm shown in FIG. 1. 

The ornamental design for a boom arm, as shown and described. 